﻿using System;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using EnvDTE;
using EnvDTE80;
using Microsoft.VisualStudio.Shell;

namespace VsExt.OpenContainingFolder
{
    /// <summary>
    /// This is the class that implements the package exposed by this assembly.
    ///
    /// The minimum requirement for a class to be considered a valid package for Visual Studio
    /// is to implement the IVsPackage interface and register itself with the shell.
    /// This package uses the helper classes defined inside the Managed Package Framework (MPF)
    /// to do it: it derives from the Package class that provides the implementation of the 
    /// IVsPackage interface and uses the registration attributes defined in the framework to 
    /// register itself and its components with the shell.
    /// </summary>
    // This attribute tells the PkgDef creation utility (CreatePkgDef.exe) that this class is
    // a package.
    // This attribute is used to register the information needed to show the this package
    // in the Help/About dialog of Visual Studio.
    // This attribute is needed to let the shell know that this package exposes some menus.
    [PackageRegistration(UseManagedResourcesOnly = true)]
    [InstalledProductRegistration("#110", "#112", "1.0", IconResourceID = 400)]
    [ProvideMenuResource("Menus.ctmenu", 1)]
    [Guid(GuidList.guidOpenContainingFolderPkgString)]
    public sealed class VsExtOpenContainingFolderPackage : Package
    {
        /// <summary>
        /// Default constructor of the package.
        /// Inside this method you can place any initialization code that does not require 
        /// any Visual Studio service because at this point the package object is created but 
        /// not sited yet inside Visual Studio environment. The place to do all the other 
        /// initialization is the Initialize method.
        /// </summary>
        public VsExtOpenContainingFolderPackage()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering constructor for: {0}", this.ToString()));
        }

        /// <summary>
        /// Initialization of the package; this method is called right after the package is sited, so this is the place
        /// where you can put all the initialization code that rely on services provided by VisualStudio.
        /// </summary>
        protected override void Initialize()
        {
            Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
            base.Initialize();

            // Add our command handlers for menu (commands must exist in the .vsct file)
            OleMenuCommandService mcs = GetService(typeof(IMenuCommandService)) as OleMenuCommandService;

            if (null != mcs)
            {
                CommandID menuCommandItemID = new CommandID(GuidList.guidOpenContainingFolderCmdSetItem, (int)PkgCmdIDList.cmdidOpenContainingFolderItem);
                MenuCommand menuItemItem = new MenuCommand(MenuItemCallback, menuCommandItemID);
                mcs.AddCommand(menuItemItem);

                CommandID menuCommandCodeID = new CommandID(GuidList.guidOpenContainingFolderCmdSetCode, (int)PkgCmdIDList.cmdidOpenContainingFolderCode);
                MenuCommand menuItemCode = new MenuCommand(MenuItemCallback, menuCommandCodeID);
                mcs.AddCommand(menuItemCode);
            }
        }

        /// <summary>
        /// Gets the selected UI hierarchy.
        /// </summary>
        /// <param name="solutionExplorer">The solution explorer.</param>
        /// <returns></returns>
        private UIHierarchyItem GetSelectedUIHierarchy(UIHierarchy solutionExplorer)
        {
            object[] selection = solutionExplorer.SelectedItems as object[];

            if (selection != null && selection.Length == 1)
            {
                return selection[0] as UIHierarchyItem;
            }

            return null;
        }

        /// <summary>
        /// This function is the callback used to execute a command when the a menu item is clicked.
        /// See the Initialize method to see how the menu item is associated to this function using
        /// the OleMenuCommandService service and the MenuCommand class.
        /// </summary>
        private void MenuItemCallback(object sender, EventArgs e)
        {
            DTE2 dte = (DTE2)GetService(typeof(DTE));

            // Get the the Solution Explorer tree
            UIHierarchy solutionExplorer = dte.ToolWindows.SolutionExplorer;

            // Check if there is any open solution
            if ((solutionExplorer.UIHierarchyItems.Count == 0))
            {
                return;
            }

            UIHierarchyItem item = GetSelectedUIHierarchy(solutionExplorer);

            if (item != null)
            {
                // this command is only available from the code window and itemNode so
                // it's almost guaranteed to be a project item.
                ProjectItem projectItem = item.Object is ProjectItem ? (ProjectItem)item.Object : null;

                if (projectItem != null)
                {
                    string fileName = projectItem.get_FileNames(1);

                    System.Diagnostics.Process.Start("explorer.exe", string.Format("/e,/select,{0}", fileName));
                }
            }
        }
    }
}
